Radial polarization conversion component, azimuthal polarization conversion component and manufacturing method thereof

A method for manufacturing a radial polarization conversion component comprising the steps of:

• placing a holographic recording material between two right-angle prisms, wherein the holographic recording material is divided into at least four sector-shaped areas and is partially shielded, and only one of the sector-shaped areas is exposed each time;
• allowing a recording light with a wavelength of 300 to 850 nm to pass through an electronic shutter, a filter and a collimating lens, the recording light being incident on one of the right-angle prisms, passing through the exposed sector-shaped area of the holographic recording material and the other right-angle prism and being reflected by a reflector to form an object light, the recording light and the object light interfering in the exposed sector-shaped area of the holographic recording material;
• rotating the holographic recording material to expose the other sector-shaped areas one by one and repeating the above steps for construction;
• wherein the right-angle prisms each have a base angle, the relationship between the base angle and the diffraction angle caused by the incident reconstruction light is:
• θ
• d
• =
• 2
• ·
• sin
• -
• 1
• ⁢
• {
• (
• λ
• 2
• λ
• 1
• ·
• n
• f
• ⁢
• 1
• n
• f
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• 2
• ·
• d
• 1
• d
• 2
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• ·
• [
• (
• 1
• -
• n
• p
• 2
• n
• f
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• 1
• 2
• ·
• sin
• 2
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• θ
• p
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• 1
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• +
• (
• d
• 2
• d
• 1
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• n
• p
• n
• f
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• where, θd is the diffraction angle when the reconstruction light is incident on the holographic recording material;
• θp1 is the base angle;
• λ1 is the wavelength of the recording light;
• λ2 is the wavelength of the reconstruction light;
• nf1 is the index of refraction of the holographic recording material corresponding to the recording light;
• nf2 is the index of refraction of the holographic recording material corresponding to the reconstruction light;
• np is the index of refraction of the right-angle prism corresponding to the recording light;
• d1 is the thickness of the holographic recording material before exposure;
• d2 is the thickness of the holographic recording material after exposure;
• and
• wherein the radial polarization conversion component includes a complete circular volume hologram, the volume hologram is radially divided into at least four sector-shaped areas, and the sector-shaped areas each enable an incident reconstruction light with a wavelength of 200 to 600 nm to have a diffraction angle of 48.19 degrees or angles within a few degrees of 85 degrees.